/**
 * Copyright 2011-2013 FoundationDB, LLC
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* The original from which this derives bore the following: */

/*

   Derby - Class org.apache.derby.impl.sql.compile.ValueNodeList

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package com.bj58.sql.parser;

import com.bj58.sql.StandardException;

/**
 * A ValueNodeList represents a list of ValueNodes within a specific predicate 
 * (eg, IN list, NOT IN list or BETWEEN) in a DML statement.    
 * It extends QueryTreeNodeList.
 *
 */

public class ValueNodeList extends QueryTreeNodeList<ValueNode>
{
    /**
     * Add a ValueNode to the list.
     *
     * @param valueNode A ValueNode to add to the list
     *
     * @exception StandardException     Thrown on error
     */

    public void addValueNode(ValueNode valueNode) throws StandardException {
        add(valueNode);
    }

    /**
     * Check if all the elements in this list are equivalent to the elements
     * in another list. The two lists must have the same size, and the
     * equivalent nodes must appear in the same order in both lists, for the
     * two lists to be equivalent.
     *
     * @param other the other list
     * @return {@code true} if the two lists contain equivalent elements, or
     * {@code false} otherwise
     * @throws StandardException thrown on error
     * @see ValueNode#isEquivalent(ValueNode)
     */
    boolean isEquivalent(ValueNodeList other) throws StandardException {
        if (size() != other.size()) {
            return false;
        }

        for (int i = 0; i < size(); i++) {
            ValueNode vn1 = get(i);
            ValueNode vn2 = other.get(i);
            if (!vn1.isEquivalent(vn2)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Return whether or not this expression tree represents a constant expression.
     *
     * @return Whether or not this expression tree represents a constant expression.
     */
    public boolean isConstantExpression() {
        int size = size();

        for (int index = 0; index < size; index++) {
            boolean retcode;
            retcode = get(index).isConstantExpression();
            if (!retcode) {
                return retcode;
            }
        }

        return true;
    }

}
